Science on Screen is a national series that pairs classic and documentary films with panel discussions on science. Tonight’s movie is “The Man Who Fell to Earth,” starring the late David Bowie, to be followed by a discussion on water issues led by Mace Hack, state director of the Nature Conservancy; Buey-Ray Tuft, founder of Aqua-Africa; and Jess Benjamin, a ceramic artist. The movie starts at 7 pm; tickets run $4.50-$9.